Some ideas with water
Ancient Ice Mirror
Cost: 1
Artifact
4
: Exchange control of Magical Mirror with target creature or permanent
Brain Parasite
Cost: 2
Creature
0/1
4
: Gain control of target creature as long as Brain Parasite is in play and do not use its ability
Flying Fish
Cost: 2
Creature
6/6
: Dive
Flying Fish die at end of turn if not being drown